Structures



M. N. SALVATI, DECD. G. BEER AND A. TEDESCO. JOINT EXECUTORS.

ARRANGEMENT FOR CONNECTING WOODEN RODS WITH METAL BARS IN AEROPLANE STRUCTURES.

APPLICATION men JULY 25,1919.

1 25,805, Patent-ed Dec. 23, 1919.

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MICHELE 1\T. SALVATI, DECEASED, LATE 0J3 TURIIN, ITALY, BY GUIIDO BEER AND Alt-RIGID 'III'JEDESGO, JOINT EXECU'IOBS, 0F TURIN, ITALY, ASSIGNORSTO SOGIETA ANONIMA STABILIMEN'TI BIAK, 0F TUBIIN, ITALY, A COMPANY OF ITALY.

WOODEN RODS; WITH METAL BARS IN AEROPLANE STRUCTURES.

Specification of Letters Patent.

Patented cc. 2 3, 191%.

Application filed July 25, 1919. Serial No. 313,215.

To all whom it may concern:

Be it known that we, GUIDo BEER and Ammo Tnonsoo, subjects oi? the King of Italy, and residents of Turin, litaly, joint executors of MICHELE N. SALvA'rI, deceased, late of Turin, Italy, do hereby declare that said MronnL-n N. SALVATI did in his life time invent certain new and useful Arrangement for Connecting l Vooden Bods with Metal Bars in Aeroplane Structures, of which the following is a specification.

It is known that advantages are secured by using in aeroplane structures metal bars instead of common wooden ones because of reduced weight and increased resistance thus obtained; on the other hand when using said metal bars diiiiculties are found in safely connecting the wooden rods with the metal bars.

This invention has for its object an arrangement allowing of reaching said purpose by simple means; according to this invention the metal bar web is provided at the points at which the wooden rod has to be connected, with a number of openings through which are inserted plates which are engaged with the web of said wooden rod, preferably by interposing between said plates and web the wooden blocks at present used for strengthening the wooden rod flanges at the places at which they do not bear on the metal bar.

The annexed drawing shows by way of example one construction oi the arrangement according to this invention; Figure 1 is the side View of the wooden rod the metal bar being shown in section on line a';c of Fig. 2 and Fig. 2 is the side view of the metal bar at the connecting point, the wooden rod being in section.

As shown in said figures the web 2 of wooden rod is provided with a suitable opening passed through by metal bar 1 which may have any required contour, the flanges 3 of said wooden rod bearing on the outer surfaces of flanges of metal bar 1, and said web 2 is provided near edges of said openings with strengthening wooden blocks 4: extending from a flange thereof to other one, as used at present.

In the construction illustrated the web of metal bar 1 is provided with an opening 5 larger than the whole thickness of web 2 and blocks 1} and two plates 6 made of strong wood are inserted into said opening, one at each side of web 2, the same being connected, by means of screws and gluing, with the biock 4: adjacent thereto and thence with web 2 of the wooden rod.

Instead of a single opening 5 having such a width as to overcome outer edges of blocks l, the web of metal bar 1 may be provided with two separate openings each at one side of the web2 and having awidth correspond ing with thickness of plate 6; further on each side of web 2 of the wooden rod there may be arranged a plurality of plates 6.

In any case owing to plates 6 passing through web of metal bar and being strongly connected with the web of wooden rod, a safe connection is obtained between wooden rods and metal bars, the direct transmission of stresses being thus obtained.

What we claim as the invention and desire to secure by United States Letters Patent 1s 1. A connection for wooden rods and metal bars in aeroplane structures, comprising a metal bar having a web and flanges, a wooden rod having a web and flanges and provided with an opening in said web through which said metal bar passes, the flanges of said wooden rod bearing on outer surfaces of flanges of said metal bar, the Web of said metal bar having an opening at the crossing point of said rod and bar, and wooden plates inserted in said opening the same embracing said wooden rod web and being connected therewith.

2. A connection for wooden rods and metal bars in aeroplane structures comprising a metal bar having a web and flanges, a wooden rod having a web and flanges and provided with an opening in said web through which said metal bar passes, the flangesof said wooden rod bearing 011 the outer surfaces of flanges of said metal bar, 7

strengthening blocks embracing said wooden rod web at the edges of said opening, the web of said metal bar having an opening at the crossing point of said rod and bar, and wooden plates inserted in said opening the same embracing said blocks and being connected with them and with said web.

3. A connection for wooden rods and metal bars in aeroplane structures, comprising a metal bar having a Web and flanges,

. a Wooden rod having a Web and flanges and provided With an opening in said Web through which said metal bar passes, the

ings in register With outer edges of said Wooden rod Web, and Wooden plates inserted in said openings the same embracing said 10 Wooden rod Web and being connected therewith.

Signed at Turin, Italy, July 2, 1919.

GUIDO BEER, ARRIGO TEDESCO, Joint Eweeutors of Michele N. Salvati, de-

ceased. 

